#include <stdio.h>
int main()
{
    void actionl(int, int), action2(int, int);
    char ch;
    int a = 15;
    int b = 23;
    ch = getchar();
    switch (ch)
    {
    case 'a':
    case 'A':
        actionl(a, b);
        break;
    case 'B':
        action2(a, b);
        break;
    default:
        putchar('\a');
    }
    return 0;
}
void actionl(int x, int y)
{
    printf("x+y=%d\n", x + y);
}

void action2(int x, int y)
{
    printf("x * y=%d\n", x * y);
}